[1][2] She decided in late February 2013 to take an indefinite break from tennis[3] and studied English literature at the University of British Columbia where she was also part of the rowing team.

[6] In October 2017, Marino announced her intention to return to the pro circuit but her comeback was delayed due to ITF administrative regulations.

[16] Marino won in August 2008 her first singles title at the $10k in Trecastagni and two in doubles, respectively, in Evansville, Indiana in July and in Southlake, Texas in October of the same year.

[17][18][19] In November 2008, she won her first WTA Tour main-draw match at the Challenge Bell as a qualifier, defeating Jill Craybas in the first round.

[20] In September 2009 at the Challenge Bell, Marino reached the second round for the second straight year with a win over Lauren Albanese, but lost her next match to Julia Görges.

After winning three qualifying matches to enter the main draw, she beat Ksenia Pervak to set up a second round clash with world No.

Marino made it to the final and defeated Alison Riske in three tough sets to win the tournament, the second singles title of her career.

[34] In September, she reached the quarterfinals of the Challenge Bell for the second straight year after beating fellow Canadians Stéphanie Dubois and Aleksandra Wozniak in the first and second round, respectively, but lost to Michaëlla Krajicek.

[39] The next month, in only her fifth tournament since coming back, she defeated fellow Canadian Sharon Fichman to win the $25k in Rock Hill, South Carolina as a qualifier.

[49] Marino began the season using a protected ranking to gain entry into the qualifying tournament for the Australian Open, held in Dubai mid-January.

She qualified for her first Grand Slam tournament in 10 years, defeating Jaqueline Cristian, Viktoriya Tomova and Maryna Zanevska without dropping a set.

[50] She was granted direct entry into the Gippsland Trophy, one of three makeshift WTA lead-up tournaments created for the participants of the upcoming Australian Open, also held in Melbourne, but lost in the first round to Jasmine Paolini.

[57] Partnering Liang En-shuo, Marino won her first WTA 125 doubles title at the LTP Women's Open, defeating to Erin Routliffe and Aldila Sutjiadi in the final which went to a deciding champions tiebreak.

[65][66] Marino qualified for the WTA 250 Nottingham Open in June, defeating Viktorija Golubic in the first round,[67] before losing her next match to third seed and eventual champion Katie Boulter.

[69][70] In October, she won her third ITF title of the season at the W75 Calgary National Bank Challenger, dropping just one set in the entire tournament to fellow Canadian Cadence Brace in the semifinals, before defeating qualifier Anna Rogers in the final.

[71][72] Partnering Carmen Corley, Marino won her second WTA 125 doubles title at the Abierto Tampico tournament, defeating Alina Korneeva and Polina Kudermetova in the final.

[73] Playing as the sixth seed, in her final individual tournament of the year, Marino secured the biggest title of her career to date at the Dow Tennis Classic WTA 125 event in Midland, Michigan.

[78][79][80] Marino started her 2025 season at the Auckland Classic, where she defeated fourth seed Lulu Sun in the first round,[81] before losing her next match to Bernarda Pera.

[84] Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.